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* Add meta-dependency package for optional dependencies, where at least one
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dependency must be satisfied:
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Dependencies = ["petsc" or "umfpack", "python"]
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meaning we want either 'petsc' or 'umfpack', but we need at least one of them
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matrx = Alternatives('petsc','umfpack')
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Dependencies = [matrix, 'numpy-1', 'ufc']
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matrix = Dependency("petsc", "umfpack", type="any")
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-> type can be 'any' or 'all', defaults to 'all'
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Again, we put matrix in the Dependencies list
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We also need to set HAVE_<PACKAGE> flags accordingly